Household vehicle ownership is a critical demographic characteristic influencing many aspects of travel demand. Using the 1995 NPTS data set, this research proposes a multivariate negative binomial model to investigate households’ distinctions in vehicle purchases among passenger cars, SUVs, pickups, and minivans. This model structure is capable of capturing unobserved heterogeneity across the ...

Maintaining diversity is important for the performance of evolutionary algorithms. Diversity-preserving mechanisms can enhance global exploration of the search space and enable crossover to find dissimilar individuals for recombination. We focus on the global exploration capabilities of mutation-based algorithms. Using a simple bimodal test function and rigorous runtime analyses, we compare wel...

An adaptive niching scheme called coevolutionary shared niching (CSN) is proposed, implemented, analyzed and tested. The scheme overcomes the limitations of xed sharing schemes by permitting the locations and radii of niches to adapt to complex landscapes, thereby permitting a better distribution of solutions in problems with many badly spaced optima. The scheme takes its inspiration from the m...

Functional genomics is as powerful as the diversity of phenotypes that are associated with the databases of DNA sequences and their expression patterns. A special bioinformatics challenge is to include detailed information in genomic databases about subtle phenoptypic differences that show continuous distribution in segregating populations. The objective of Real Time QTL (RTQ) is to present in ...

A multi-objective differential evolution algorithm based on adaptive mutation strategies and partition selected search is proposed based on classical differential evolution (DE) to further improve the convergence and diversity of multi-objective optimization problems. This algorithm improves mutation operation in DE, makes search oriented and ensures the convergence of algorithm by adaptively s...

The exposure rate due to the gamma-ray natural background in some representative areas of the Country was studied by means, of a portable high-pressure iQuization ch."mlber. In ali limited area such study was integrated by a survey 0n the quality of ba.ckgrowlC! radiation, carried out by gamma spectrometric measurements. . The spectrometric study permitte<;l the determination of the contrilbuti...

In the present work the spread of epidemic is studied over complex networks which are characterized by power law degree distribution of links and heterogeneous rate of disease transmission. The random allocation of epidemic transmission rates to the nodes results in the heterogeneity, which in turn causes the segregation of nodes in terms of various sub populations. The aim of the study is to g...

We consider an asexual biological population of constant size N evolving in discrete time under the influence of selection and mutation. Beneficial mutations appear at rate U and their selective effects s are drawn from a distribution g(s). After introducing the required models and concepts of mathematical population genetics, we review different approaches to computing the speed of logarithmic...

The number of the unique individuals in the population is of great importance in evaluating the disclosure risk of a microdata set. We approach this problem by considering some basic superpopulation models including the gamma-Poisson model of Bethlehem et al. (1990). We introduce Dirichlet-multinomial model which is closely related but more basic than the gamma-Poisson model, in the sense that ...

The Precambrian rocks in western Ethiopia consist of highand low-grade terranes intruded by granitoids with a wide compositional spectrum. The formation ages of these granitoid rocks are, so far, poorly understood. Single-grain zircon Pb/Pb evaporation and conventional U/Pb dating conducted on four granitoids places time constraints on their emplacement and tectonothermal events. Three granitoi...